Analysis of measurement uncertainty evaluation method in electrical measurement - Database & Sql Blog Articles

The purpose of the measurement is to evaluate the merits of the measured object based on the measured data. The accuracy of the measurement directly affects the quality of a product and the economic benefits of the enterprise. For today's economic globalization, the measurement accuracy even affects the country. Import and export economic benefits. In recent years, countries

instrument

Metrology scholars have done a lot of research on the scientific research and accuracy of measurement methods. With the development of profit technology and the maturity of various statistical theories, the measurement hardware and software have been greatly developed.

Instrument measurement

The accuracy of the proposed higher requirements.

In the experiments on the measurement of electrical instruments, the results of the measurements are not the true values ​​of the products being tested. The concept of “error” was the first to be debated. Until 1927, the German physicist Heisenberg based on the theory of quantum mechanics. The uncertainty relationship is proposed. Subsequently, the uncertainty evaluation theory is widely quoted in the electrical measurement.

1. Uncertainty standard

In order to eliminate the controversy caused by the use of the concept of "error", as the process of economic integration and globalization of trade accelerates, it also indirectly urges the measurement and measurement results required by countries to have a uniform evaluation standard and avoid Unnecessary losses are caused by standard deviations in the measurement of the same product in different countries. In this case, the measurement uncertainty goes through a series of development stages and eventually forms an international standard.

In 1986, the International Organization for Standardization (ISO), the International Electrotechnical Commission (IEC), the International Commission of Metrology (CIPM), and the International Organization of Legal Metrology (0IML) formed the International Uncertainty Working Group for measurement, standards, and quality. , certification, Lee Yi Yan, a guide to the standard of uncertainty in production. The International Uncertainty Working Group has been revised repeatedly. In 1993, the Guide to Measurement Uncertainty (GUM) was developed. The guidelines were obtained by BIPM, OIMI, ISO, IEC and the International Union of Theoretical and Applied Chemistry (IUPAC). Approved by the Union of Theoretical and Applied Physics (IUPAP) and the International Federation of Clinical Chemistry (IFCC), published by ISO. The GUM developed by the International Uncertainty Working Group is an important authoritative document of international organizations. Since its publication in 1993, it has been widely applied and distributed. At present, GUM's implementation in the world has pushed the uncertainty to the latest level. It is the basis of the modern uncertainty method and application. In November 1996, China Institute of Metrology and Research began to develop the "Specification of Measurement Uncertainty". In January 1999, China's State Bureau of Quality and Technical Supervision approved the issuance of the National Measurement Technology Specification JJF1059-1999, “Measurement Uncertainty Evaluation and Representation”.